| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 11/12/2021 | ExOne Co | XONE | Disposition | Common Stock, par value $0.01 | 35k | $0.00 | $0 | | 11/12/2021 |
| 11/12/2021 | ExOne Co | XONE | Disposition | Common Stock, par value $0.01 | 4.2M | $0.00 | $0 | See footnote | 11/12/2021 |
| 11/12/2021 | ExOne Co | XONE | Disposition | Common Stock, par value $0.01 | 5k | $0.00 | $0 | | 11/12/2021 |
| 05/12/2021 | ExOne Co | XONE | Grant | Common Stock, par value $0.01 | 5k | $0.00 | $0 | | 05/12/2021 |
| 05/12/2021 | ExOne Co | XONE | Grant | Common Stock, par value $0.01 | 5k | $0.00 | $0 | | 05/12/2021 |
| 03/16/2021 | ExOne Co | XONE | Gift | Common Stock, par value $0.01 | 57.6k | $0.00 | $0 | See Footnote | 05/12/2021 |
| 03/18/2020 | ExOne Co | XONE | Purchase | Common Stock, par value $0.01 | 25k | $4.68 | $117k | See Footnote | 03/18/2020 |
| 02/05/2020 | ExOne Co | XONE | Grant | Common Stock, par value $0.01 | 7.5k | $0.00 | $0 | | 02/05/2020 |
| 05/15/2019 | ExOne Co | XONE | Grant | Common Stock, par value $0.01 per share | 5.5k | $0.00 | $0 | | 05/15/2019 |
| 08/13/2018 | ExOne Co | XONE | Grant | Common Stock | 12k | $0.00 | $0 | | 08/13/2018 |
| 01/10/2016 | ExOne Co | XONE | Purchase | Common Stock, par value $0.01 per share | 1.4M | $9.13 | $13M | By S. Kent Rockwell Revocable Trust | 01/10/2016 |
| 12/19/2014 | ExOne Co | XONE | Grant | Common Stock, par value $0.01 | 2.5k | $0.00 | $0 | By S. Kent Rockwell Revocable Trust | 12/19/2014 |
| 12/11/2014 | ExOne Co | XONE | Gift | Common Stock, par value $0.01 | 378.4k | $0.00 | $0 | By S. Kent Rockwell Revocable Trust | 12/19/2014 |
| 09/09/2013 | ExOne Co | XONE | Sale | Common Stock, par value $0.01 | 1.3M | $59.06 | $77.9M | By S. Kent Rockwell Revocable Trust | 09/09/2013 |
| 08/20/2013 | ExOne Co | XONE | Gift | Common Stock, par value $0.01 | 450k | $0.00 | $0 | By S. Kent Rockwell Revocable Trust | 08/20/2013 |
| 02/12/2013 | ExOne Co | XONE | Sale | Common Stock, par value $0.01 | 611.7k | $16.74 | $10.2M | By S. Kent Rockwell Revocable Trust | 02/12/2013 |
| 02/12/2013 | ExOne Co | XONE | Conversion | Common Stock, par value $0.01 | 1.4M | $0.00 | $0 | By S. Kent Rockwell Revocable Trust | 02/12/2013 |
| 02/06/2013 | ExOne Co | XONE | Conversion | Class A Preferred Stock | 13M | $0.00 | $0 | By S. Kent Rockwell Revocable Trust | 02/06/2013 |
| 02/06/2013 | ExOne Co | XONE | Sale | Common Stock, par value $0.01 | 611.7k | $16.74 | $10.2M | By S. Kent Rockwell Revocable Trust | 02/06/2013 |
| 02/06/2013 | ExOne Co | XONE | Conversion | Common Stock, par value $0.01 | 1.4M | $0.00 | $0 | By S. Kent Rockwell Revocable Trust | 02/06/2013 |
| 12/09/2009 | ARGON ST, Inc. | STST | Exercise | Common Stock | 4k | $0.00 | $0 | President, Rockwell Holdings Inc. | 12/09/2009 |
| 12/09/2009 | ARGON ST, Inc. | STST | Exercise | Restricted Stock Units | 4k | $0.00 | $0 | | 12/09/2009 |